Leather-rolling machine



(No Model.)

D. KNOX.

LEATHER ROLLING MACHINE. No 311.498. Patented Feb. 3, 1885. u

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"ihvrrnn Sararns PATENT U rich,

DAVID KNOX, OF LYNN, MASSACHUSETTS.

LEATHER-=ROLLING IViACi-HNE.

SPECIFICATION forming part of Letters Patent No. 311,4r98, datedFebruary 3, 1885.

Application filed November 3, 1884.

To aZZ whom it may concern.-

Be it known that I, DAVID KNOX, of Lynn, in the county of Essex andState of Massachir setts, have invented certain Improvements inLeathenRolling Machines, of which the following is a specification.

This invention relates to machines for rolling or otherwise acting onleather or other material, having two rolls or rotating bodies, onemounted in fixed bearings which are movable toward and from said fixedbearings to vary the pre sure exerted on the rolls by the article passedbetween them, the invention being mainly intended for rolling leather.

The object of the invention is to provide improved means for moving oradjusting the movable roll with relation to its companion roll; and tothis end it consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification,Figure 1 represents a perspective View of a leather-rolling machineprovided with my improvements. Fig. 2 represents a side elevation of theadjustable lower roll and its supporting and adjusting mechanism. Fig. 3is a side view of the treadle and its connecting ink. Fig. 4 representsa perspective view of the wedges where by the lower roll is adjusted.

Thesame letters of reference indicate the same parts in all the figures.

In the drawings, a represents standards, which,with the connecting-barsb b, constitute the frame of the machine.

0 and d represent the rolls which act on the leather or other materialto be rolled. The upper roll, 0, isjournaled in fixed hearings in thestandards a (awhile the lower roll is journaled in boxes 0 e, which arevertically movable in slots in said standards. The boxes 0 are supportedby the shorter arms of the two bell-crank levers ff, which are pivotedat g g to ears on the standards a a. The longer arms of the levers ffproject downwardly, and are connected by links h h to a transverse bar,t, passing through a slot in a yoke or hO1dG1,j, which is pivoted to atreadle, k, the latter being pivoted at its rear end to one of theconnecting-bars Z). A spring, Z, secured at one end to the treadle 7cand at its other end to another connecting-bar b, normally raises the(N0 model free end of said treadle, and draws the longer arms of theleversff inwardly by means of the links it h, thus depressing theshorter arms of said levers and allowing the boxes 6 e to drop and lowerthe roll d, which is thus separated from the upper roll. hen the treadleis thus raised by the spring, the links h h are inclined downwardly fromthe bar 2' on the treadle to the ends of the longer arms of the leversff, as shown in Fig. 2, the links being thus held in position to act asmembers of a togglejoint when they are moved intoline, or approximatelyinto line, with each other by the depression of the treadle.

' It will be seen that when the operator depresses the treadle he exertsa powerful outward pressure on thelonger arms of the lever ff by meansof the toggle links, thus raising the shorter arms of said levers andpressing the boxes 6 e and the roll d upwardly, the power applied to thetreadle being multiplied by the described arrangement of the togglelinksand levers, so that a powerful upward pressure may be exerted 011 thelower roll, which may be thus caused to exert any desired degree ofpressure on the leather or other material being rolled. The slot j inthe yoke j, through which the bar 2' passes, is wider than the thicknessof said bar, so that as the treadle rises and falls the necessaryvariations of position which the yoket' experiences will not cause it tobind upon the bar, which is not movable laterally. The width of the slotj, together with the pivotal counection of the yoke j to the treadle,compensate for all the relative changes in the positions of the treadleand bar, caused by the swinging movements of the treadle, and make saidmovements easy. v m m represent wedges upon which the boxes 0 e of thelower roll bear directly, said wedges being supported by blocksn a,interposed between their under sides and the shorter arms of theleversf, the boxes ehaving no positive connection with the blocks a, sothat they can be raised and lowered independently of said blocks bymoving the wedges m 112, thus e11- abling the roll I) to be adjusted asto its distance from the upper roll whenitis not pressed against theupper roll by the mechanism above described. The wedges m m are moved inand out simultaneously by a connectinghar, s, having right-handscrew-threads at one end engaging the one wedge, and left-hand threadsat the other end engaging the other wedge. The bar sis made in twosections, 2 and 3, which are inserted in sockets in acoupling, 4,constituting the hub of a band-wheel, 5, and are'adjustable lengthwisein said sockets, setscrews 6 6 holding the sections wherever they may beadjusted. By thus connecting the rod 8, I am enabled to adjust thelengthso that it may hold the wedges at any desired distance apart.

It will be seen that the force which the operator exerts on the roll dincreases as the links it h are being brought into line with each otheruntil they are absolutely in alignment; hence the force becomes greateras the roll d rises, the operator being enabled to exert the greatestpressure when the roll d is already pressingthe leather against theupper roll, care being taken to adjust the wedges m m so that when theroll d is pressed upwardly to the farthest extent the links h h will notbe brought quite into alignment.

I do not limit myself to the employment of ,the described mechanism tomachines forrolling leather. The toggle-joint and levers may be used forimparting pressure to a roll or rotary body in other machines withoutdeparting from the spirit of my inventionfor example, the machine forputting out and cleaning skins and leather, shown in the applicationofJ. Hodskinson, Serial No. 147,135, filed herewith, the toggle-j ointand levers being employed in said machine to press upwardly a cylinderon which a skin is supported while being operated on by spiral blades orflanges on a roll mounted in fixed bearings, the skin being pressedagainst said spiral blades by the togglejoint and levers, the spiral]y-flanged roll and theskin-supporting cylinder being equivalents of therolls 0 and d, (shown in the present application,) so far as myimprovements are concerned.

I claim- 1. As a means for imparting pressure to a movable roll or anequivalent pressure device,

two pivoted bell-crank levers having longer and shorter arms, andsupporting the pressure device on their shorter arms, a treadle betweenthe longer arms of said levers, and toggle-links connecting the treadlewith the longer arms of the levers, said links being arranged to bebrought into line, or approximately so, by the depression of thetreadle, and thereby act on the bell-crank levers, as set forth.

2. The combination of a roll or its specified equivalent journaled infixed bearings, a co operating roll or cylinderjournaled in movablebearings,the two-armed pivoted levers supporting said movable hearingson their shorter arms, the toggle-links connected to the longer arms ofsaid levers, and the treadle supporting said links, as set forth.

3. The combination ofthe supporting-frame, the roll 0, j ournaled infixed bearings therein, the roll d,journaled in movable bearings, thepivoted two-armed levers ff, supporting said movable'bearings on theirshorter arms, the treadle located between the longer arms of the levers,a spring whereby said treadle is normally raised, and the toggle-linksconnecting the treadle and the longer arms of the levers, as set forth.

4. The combination, with the movable bearings or boxes, of the wedges mm, supporting the boxes, and the connecting device composed of twosections, 2 3, and the socketed hub or coupling 4, in which saidsections are adj ustable, as set forth.

5. The combination of the leversff, thelinks h h, the connecting-bar i,the treadle It, and the yoke j, pivoted to the treadle, and having aslot, j, wider than the bar z, through which slot said bar passes, asset forth.

In testimony whereof I have signed my name to this specificatiomin thepresence of two subscribing witnesses, this 23d day of October, 1884.

DAVID KNOX.

Vitnesses:

O. F. BROWN, H. BROWN.

